شماره راهنما :
1208 دكتري
پديد آورنده :
رجب زاده دره، فاطمه
عنوان :
مطالعه و بررسي تجربي انتقال حرارت جوشش هسته‌اي نانو سيالات آبي آلومينا بر سطوح ساده و ريز ساختار
گرايش تحصيلي :
مهندسي شيمي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي شيمي
صفحه شمار :
ش، ۲۲۶ص.: مصور، جدول، نمودار
استاد راهنما :
مسعود حق شناس فرد، محسن نصر اصفهاني
استاد مشاور :
حميدرضا سليمي جزي
توصيفگر ها :
جوشش هسته اي , سيالات آبي , آلومينا , ريز ساختار , پاشش حرارتي
استاد داور :
نسرين اعتصامي، احمد صابونچي، محسن دوازده امامي
تاريخ ورود اطلاعات :
1397/04/30
رشته تحصيلي :
مهندسي شيمي
كد ايرانداك :
ID1208 دكتري
چكيده انگليسي :
An Experimental Investigation of Pool Boiling Characteristics of Alumina Water Nanofluid Over Simple and Ultrafine Structured Surfaces Fatemeh Rajabzadeh f rajabzadeh@ce iut ac ir Date of Submisson April 30 2018 05 19 Department of Chemical Engineering Isfahan University of TechnologyDegree Ph D Language FarsiSupervisor Masoud Haghshenas Fard haghshenas@cc iut ac ir Mohsen Nasr Esfahani mnasr@cc iut ac irAbstractAn experimental work is conducted on pool boiling heat transfer of water and alumina basedaqueous nanofluids on the upper face of a copper block Nanofluids with various concentrationsare employed and two simple surfaces with some ultrafine structured surfaces are used as theheating surfaces The structured surfaces were produced using the thermal spray coating methodand are various in the viewpoints of material coating copper or aluminum type of surfacestructure micro or nano and roughness The results indicated that CHF in nanofluid boiling on all test surfaces was more than that of thewater Improvement of surface wettability which determined by deduction of static contact angleis the main factor in the increment of CHF Our results show CHF in boiling of fluids on themachined surface is 8 5 higher than CHF on the polished surface Iin both material coating mostly CHF is increased in boiling over surfaces with more roughness value The maximum ofCHF enhancement of a fluid by increasing the roughness is about 14 and CHF values of bothnanostructured surfaces with the same surface roughness but different in the viewpoint of thematerial coating are identical The change trend of HTC by adding nanoparticles in boiling ontest surfaces were different In boiling on machined copper coated micro and nanostructuredsurfaces that values of were more than unit and also surface roughness were increased bynanofluid boiling HTCs were improved by more loading of nanoparticles In about boiling onaluminum as coating material is very more than unit but nanofluid boiling decreased thesurface roughness and therefore HTC Though boiling HTC of each fluid on the micro structuresurface was bigger than nanostructured surface but CHF on both surfaces were similar We conducted a consecutive series of nanofluid boiling on polished and also aluminum coatednanostructured surface It turns out from the results alteration of boiling performance continuesuntil about four cycles and after that the boiling performance becomes invariable and nearlysimilar The maximum of CHF enhancements in repeated boiling on polished and Al coatedsurface were 56 and 42 respectively The results also showed that the procedure of alterationsin the surface roughness and contact angle with enhancement of nanofluid boiling time on thepolished surface are asymptotic Keywordspool boiling nanofluid CHF surface roughness boiling heat transfer coefficient
استاد راهنما :
مسعود حق شناس فرد، محسن نصر اصفهاني
استاد مشاور :
حميدرضا سليمي جزي
استاد داور :
نسرين اعتصامي، احمد صابونچي، محسن دوازده امامي
